Abstract: Runners extend along the junctions of the interior side panels and the headliner of the van and define plenums for conditioned air supplied by the auxiliary heat exchanger of a climate control system, the heat exchanger being mounted beneath the floor of the van. Air distribution outlets are mounted in the runners and discharge conditioned air downwardly into the interior of the van. Conditioned air is supplied to one of the plenums by a first hose extending upwardly from the heat exhanger, along the outboard side of one of the interior side panels and into one of the runners. A second hose extends upwardly generally alongside the first hose but crosses over the van between the roof and the headliner and leads into the other runner to supply conditioned air to the other plenum.